| 摘要 |
PROBLEM TO BE SOLVED: To provide a strong paper bobbin formed of paper material easy in disposal and possible to wind comparatively heavy wire material. SOLUTION: A disk material 12 made of paper of which diameter is larger than that of a cylindrical material 11 is attached on both ends of the cylindrical material 11 made of paper of which outer body wire materials can be wound. The attaching of a pair of disk materials to the cylindrical material is carried out aligning the center of the disk material with the axis line of the cylindrical material. On the facing plane of each disk material to the cylindrical material, a protruded body 21 for connection of total cap shape is attached. The top of the protruded body for connection is inserted into the side edge of the cylindrical material to make a cylindrical cap unit 28 adhered to the inner surface of the side edge with an adhesive and the like. Three engaging pieces 27 extending from the cap unit to the circumferential direction of the base edge are provided. Each protruded body for connection is attached to the disk material by fitting and inserting corresponding engaging pieces into three engaging holes 29 drilled on the circle based on the center of the axis hole of the disk material under the condition being separated in the intervals of 120 degree.
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